screen freezes if using modalPresentationStyle = .overCurrentContext swift 5-CodePudding

I am presenting a navigation controller with modalPresentationStyle as overCurrentContext. After dismissing controller screen freezes.

I am presenting a FirstViewController with NAvigationController.

let firstVC = FirstViewController.controller()
let nvc = UINavigationController(rootViewController: firstVC)
nvc.modalPresentationStyle = .overCurrentContext
present(nvc, animated: true)

Then inside FirstViewController, I am passing navigationController to push SecondViewController

override func viewDidLoad() {
    super.viewDidLoad()
    guard let nav = navigationController else { return }
    showSecondViewController(parentController: nav)
}

func showSecondViewController(parentController: UINavigationController) {
    let secondVC = SecondViewController.controller()
    parentController.pushViewController(secondVC, animated: true)
}

Now first I am popping SecondViewcontroller on click action from SecondViewController

navigationController?.popViewController(animated: animated)

Then with some call back I am dismissing FirstViewController and NavigationControoler (nvc)

self.controller?.dismiss(animated: true)
self.nvc?.dismiss(animated: true)

Now after dismissing as above I am facing screen freeze issue. I need help to resolve this issue. Please help. Why screen is freezing. Please let me know if I am missing anything here? Thanks

CodePudding user response：

Did you see any errors in the console? I'm not clear about "some call back" as you mentioned above. Can you elaborate?

I created a small project to replicate your issue, the project includes: it works fine in my case

ViewController is the root view controller
FirstViewController is the first controller presented on top of ViewController
SecondViewController is pushed from the first view controller after the event "ViewDidLoad" happens in FirstViewController

I also created 1 onViewControllerDissmied callback in each ViewControllers (especially FirstViewController and SecondViewController)

In ViewController - I created a touch up inside event as below

    @objc func onButtonClicked() {
        let firstVC = FirstViewController()
        nvc = UINavigationController(rootViewController: firstVC)
        guard let nvc = nvc else { return }
        nvc.modalPresentationStyle = .overCurrentContext
        present(nvc, animated: true)
        mycontroller = firstVC
        firstVC.onViewControllerDimissed = { [weak self] in
            self?.mycontroller?.dismiss(animated: true)
            self?.nvc?.dismiss(animated: true)
        }
    }

FirstViewController

class FirstViewController: UIViewController {
    var label: UILabel = {
        let button = UILabel()
        button.translatesAutoresizingMaskIntoConstraints = false
        button.text = "First View Controller"
        button.textColor = .white
        return button
    }()
    var onViewControllerDimissed: (() -> Void)?
    
    override func viewDidLoad() {
        super.viewDidLoad()
        view.backgroundColor = .purple
        guard let nav = navigationController else { return }
           showSecondViewController(parentController: nav)
    }

    func showSecondViewController(parentController: UINavigationController) {
        let secondVC = SecondViewController()
        parentController.pushViewController(secondVC, animated: true)
        secondVC.onViewControllerDimissed = { [weak self] in
            self?.onViewControllerDimissed?()
        }
    }
}

SecondViewController

class SecondViewController: UIViewController {
    var label: UILabel = {
        let button = UILabel()
        button.translatesAutoresizingMaskIntoConstraints = false
        button.text = "Second View Controller"
        return button
    }()
    
    var onViewControllerDimissed: (() -> Void)?
    override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
        if let touch = touches.first {
                let position = touch.location(in: view)
                let pnt: CGPoint = CGPoint(x: position.x, y: position.y)
                if (view.bounds.contains(pnt)) {
                    onScreenTouch()
                }
            }
    }
    
    func onScreenTouch() {
        navigationController?.popViewController(animated: true)
        onViewControllerDimissed?()
    }
}